What is the Singleton design pattern used for?

To define a one-to-many dependency between objects so that changes to one object result in changes to many other objects.
To enforce a single instance of a class per application.
To ensure that a class has only one instance and provide a global point of access to that instance.
To provide a way to dynamically instantiate objects of a specified class.

The Singleton design pattern is used to ensure that a class has only one instance and to provide a global point of access to that instance. This can be useful in situations where it is important to have a single instance of a class that provides a shared resource.

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